docs: def get(name):
      '''Get a linkchecker given its name or fallback on default'''
      linkcheckers = get_enabled(ENTRYPOINT, current_app)
      linkcheckers.update(no_check=NoCheckLinkchecker)  # no_check always enabled
      selected_linkchecker = linkcheckers.get(name)
      if not selected_linkchecker:
          default_linkchecker = current_app.config.get(
                                  'LINKCHECKING_DEFAULT_LINKCHECKER')
          selected_linkchecker = linkcheckers.get(default_linkchecker)
      if not selected_linkchecker:
          log.error('No linkchecker found ({} requested and no fallback)'.format(
                    name))
      return selected_linkchecker